Urban stormwater treatment by a constructed wetland: Seasonality impacts on hydraulic efficiency, physico-chemical behavior and heavy metal occurrence

Walaszek, Milena; Bois, Paul; Laurent, Julien; Lenormand, Éloïse; Wanko, Adrien

doi:10.1016/j.scitotenv.2018.04.325

Cited by 43 publications

(14 citation statements)

References 35 publications

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“…One important yet relatively seldom studied means of metals transferring to sediments is storm water run-off. Contemporary studies [2,[5][6][7][8][9][10] revealed that storm water run-off carried metals originating from a variety of everyday activities associated with tire wear, corrosion, roof run-off and fuel combustion products. It is well established that run-off from urbanized catchment is abundant in HMs [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Heavy Metals in Sediments of Urban Streams: Contamination and Health Risk Assessment of Influencing Factors

et al. 2019

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Sediments of two urban streams in northern Poland outflowing to the Baltic Sea were assessed to explain the spatial variation in relation to urbanization level of the catchment, the role of retention tanks (RTs) and identification of pollution level. During the 3 month period of investigation sediment samples were collected from the inflow (IN) and outflow (OUT) of six RTs located on streams for flood protection. Six heavy metals (HMs) were investigated: Cu, Pb, Zn, Cd, Ni, Cr. The assessment of four geochemical enrichment indices used to quantify contamination of HMs in the sediments at IN and OUT samples was carried out. Contamination factor (CF), pollution load index (PLI), geoaccumulation index (Igeo) and potential ecological risk (RI) were calculated and the indices usefulness was assessed. Also, the hazard quotient (HQ) was calculated to assess health risk associated with dredging works. In sediments from RTs where paved surfaces constituted more than 70% of the catchment the HMs concentrations were from one to three times higher for Ni and from two to 143 times higher for Cu in comparison to soft catchment results. The extremely high Cu concentration (1114 mg/kg d.w.) found in sediments at RT Orłowska IN was most likely associated with large area of roofs covered with copper sheet. Calculation of CF, PLI, Igeo, RI, HQ indicators allows for a complex and multi-dimensional assessment of sediment status. Among these, CF and PLI classified the analyzed sediments as most polluted. Basing on the sedimentary HMs concentrations the health risk level via dermal exposure pathway was assessed as low.

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Section: Introductionmentioning

confidence: 99%

Heavy Metals in Sediments of Urban Streams: Contamination and Health Risk Assessment of Influencing Factors

et al. 2019

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“…The endogenous sources (such as the air wet settling) and rainwater drains might be the dominant source of Pb. This was also reported as exogenous heavy metals in wet period (Hyon et al., 2009; Stephane, Mouchel, Chebbo, & Thevenot, 1999; Walaszek, Bois, Laurent, Lenormand, & Wanko, 2018).…”

Section: Resultsmentioning

confidence: 70%

Occurrence and risk assessment of heavy metals in an urban river supplied by reclaimed wastewater

Zhang

Liu

et al. 2020

Water Environment Research

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Heavy metals in reclaimed water are a global problem that leads to ecological risks for the replenishment water body. This study investigated concentrations and ecological risks posed by heavy metals in SH River, Beijing, which is supplied by reclaimed water. Results showed that Cr was not detected in the sample, Cd and Pb exceeded threshold values according to regulations by 1.19% and 25.00%, respectively. The characterization of temporal and spatial of heavy metals was studied. The potential ecological risks posed by heavy metals in SH River were found to be low and safe. The risk decreased in the order Pb > Cu > Zn > Ni > Cd > As by comprehensive index assessment; this changed to Pb > Cd > As > Ni > Cu > Zn according to potential ecological risk assessment. Pb posed the greatest ecological risks and was identified as most contaminated metal. According to discussion of sampling sites and water quality, it was proposed that reclaimed water and exogenous discharges were the main sources of the heavy metals identified. This should be considered when developing catchment management strategies for heavy metals elimination and protection of the aquatic environment. If a higher level of ecological risk management is required, Pb, Cd, and Cu should be considered first and should be removed in situ through ecological remediation methods. Practitioner points Reclaimed water and exogenous discharges were the main sources of the heavy metals identified. The potential ecological risks posed by heavy metals in SH River were found to be low and safe. The risk decreased in the order Pb > Cu > Zn > Ni > Cd > As by comprehensive index assessment. Potential ecological risk assessment showed Pb > Cd > As > Ni > Cu > Zn. Pb posed the greatest ecological risks and was identified as most contaminated metal.

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“…The impact of seasonality on the performance of a 6-yearold stormwater constructed wetland (SCW) was investigated to remove HMs from urban stormwater, and it was reported that due to seasonal variation (dry/wet weather), physico-chemical parameters (temperature, dissolved oxygen (DO), pH, and redox potential) were varied and had a deleterious effect on HMs' storage in the pond sediments; however, HM removal efficiency was >97% in all seasons (Walaszek, Bois, Laurent, Lenormand, & Wanko, 2018a). Cu, Zn, and some polycyclic aromatic hydrocarbon (PAH) concentrations have been found to be impacted by hydrological characteristics for the treatment of urban stormwater in CWs (wetland efficiency decreased during rain events), while the treatment removal efficiency varied from 50% (naphthalene) to 100% for Zn during dry periods (Walaszek, Bois, Laurent, Lenormand, & Wanko, 2018b).…”

Section: Wetlands For Stormwater Treatmentmentioning

confidence: 99%

Wetlands for wastewater treatment

Ghimire

Nandimandalam

Martinez‐Guerra

et al. 2019

Water Environment Research

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This article presents an update on the research and practical demonstration of wetland treatment technologies for wastewater treatment. Applications of wetlands in wastewater treatment (as an advanced treatment unit or a decentralized system) and stormwater management or treatment for nutrient and pollutant removal (metals, industrial and emerging pollutants including pharmaceutical compounds and pathogens) are highlighted. A summary of studies involving the effects of vegetation, wetland design and operation, and configurations for efficient treatment of various municipal and industrial wastewaters is also included.

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Urban stormwater treatment by a constructed wetland: Seasonality impacts on hydraulic efficiency, physico-chemical behavior and heavy metal occurrence

Cited by 43 publications

References 35 publications

Heavy Metals in Sediments of Urban Streams: Contamination and Health Risk Assessment of Influencing Factors

Heavy Metals in Sediments of Urban Streams: Contamination and Health Risk Assessment of Influencing Factors

Occurrence and risk assessment of heavy metals in an urban river supplied by reclaimed wastewater

Wetlands for wastewater treatment

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